Casting- device



ATTORN EY J. 0. @CDYLE CASTING DEVICE Filed June 25. 192115 Patented Non 1l, 1924.

JOHN O. BOYLE, 01T' YOUNGWOOD, PENNSYLVANIA.

CASTING DEVICE.

Application filed June 25, 1923.

To all whom t may concer/'01,'

Be it known that It, Jorrit O. Borte, a citizen ot the Unitec States residing; at Youngwood, in the county ot l' Testmoreland i and State oit Pennsylvania, have invented new and useful. Improvements in Cristiner Devices, ot wh ich the followings); is a specitication This invention relates to casting` devices, and more particularly to a device specially adapted for' use in dental work tor casting;v inlays and other articles for use in dentistry. As this general method of casting is well known in this art it is necessary to give l5 but a brief description ot this method. ln practice, an impression is taken in wan or other suitable material of a cavity for which it is desired to cast a filling, after which this model is placed in a suitable flash which is then filled with investment material, this material being a composition oit plaster ot Paris and other materials of a refractory nature, Suitable openings being provided, the investment material, which has been cast in the form ot a ring` or cylinder, then heated to melt and drive out the wax, after which metal in molten condition .is caused to iiow into the resulting cavity or hollow this metal, when set, reproducing the cavity 30 from which the wax impression was originally made.

One of the main objects oi the invention is to provide simple and efficient means whereby the investment ring may be held so as to be whirled about a horizontal anis thus forcing the molten metah centrifugal force, into the recess or cavity ot the ring` thus insuring the production oi a casti g of great density and which is an accurate reproduction of the cavity 'from which the wax impression was originally taken. A further object is to provide a device of this character which will readily accommodate investment rings of different sizes. Another object is to provide a device which will eitectually prevent spilling' ot the molten metal in the event that some of it is displaced from the investment ring. Further objects will appear from the detail descriptionn In the drawings Figure l is an elevation of the device, partly in section;

Figure 2 is a top plan view;

Figure 8 is a section talen substantially on line ?--`3 of Fig. l

Serial No. 647,699.

Figure lis a top plan view ot one ot the holding` rings;

Figure 5 is a top plan view oit' a largo-:- size holdingring. Y

My device is .more particularly adaptwl `for use in connection with an investment ring or cupel A termed ot refractory material, this cupel being' provided in its upper face 'with a depression fr, from the center ol which extends a bore or sprue hole o. ln its under face cupel A is provided with a. re cess somewhat larger than recess a, this recess being` adapted tor reception ot mould or impression of a cavity, after which recess o is tilled by a suitable investment material c. ritter this has been done the cupel il. met' be heated in any suitable or preferred manner so as to melt the material ot the mould and vaporize it, thus leaving,` the mould cavity c with which sprue hole a connnuni- Cates. The cupel A and the investment mai terial c are refractory and combine to provide simple and el'licient means tor castingl an article corresponding` with the shape ot' recess 0.

lily invention consists more particularly in the provision of a container l having;` a downwardly tapering body 2 provided with depending neck 8 the lower end ot which is closed by a bottom An annular groove 5 is provided in neck 3 adjacent to the up per end thereof, and the neclr is provided with a relatively short slot 6 extending` 'from this groove and disposed oppositely 'to a rl tively long slot 7 extending from the ejro SlotG receives an outwardly projecting loop 8 provided at the central 'portion of a spring Wire ring 9 the terminal portions oit 'which overlap and are provided with outwardly projecting; lingers l0 'which extend through slot Y. By forcing fingers l() toward each other ring' 9 may be expanded or opened up to lit into groove 5 so as to permit cupel A to be readily inserted through this ring. the cupel resting upon bottom plate il as in Figure l. After this has been done, by releasing lingers 10 ring 9 closes about and grips the cupel so as to prevent accidental loss oitv the same from the container l. After this has been done, the metal which it is desired to cast7 such as gold, is placed in recess a of cupel A and is fused by a blow-pipa the upper portion ot' the cupel serving as a crucible for this purpose. As the gold is fused it will run through the sprue opening o', into recess o', to a certain extent, but to insure a casting of the proper density and which accurately reproduces the original mould or impression, the metal should be forced under appreciable pressure through s rue hole a into recess c. For this purpose the container 1 is whirled about a horizontal axis, the metal being pressed by centrifugal torce through the sprue ope-ning into: the `listing recess.

To permit container 1 to be readily whirled, I provide this container with twok diametrica-lly opposite earsl 1l through which are secured the ends ot' a bail 12 provided with a central loop 13. A; chain 1l is secured through loop 13 in any suitable or' preferred manner, this chain beingl secured to a ring which is mounted tof turn about a collar 16 secured on ay handle 17 which tapers toward'r the ring,r ring 15 being held against movement beyond the smaller end of the handle byv a disc 18 secured by a screw 19 to the smaller end= of" handle 17, this disc being ot greater diameter than the interior diameter otl ring 15. By holding handle 17 and imparting a gyratory movement thereto, the` container 1 may be whirled about asubstan tially horizontal axis at high speed so as to torce the moltenmetal into the casting recess e in the manner previously described. The container 1 is preferably provided with two outwardly projecting lugs- 20 positioned midway between ears 111, these liigs serving to support bail 12 in horizontal position to prevent over-heating or warping of the bail during fusing ot'- the metal, while holding the bail in a readily accessible position. In Figures 1, 3 and l I have shown a small sizedv cupel? and ring. For a larger sized cupel I use the ringy illustrated in Figure 5, the groove 5 of neck 3 being intended more particularly to accommodate this larger size of ring.

It will be seen that I have provided very simple and highly eiicicnt means whereby the cupel or investment ring, asV it is trequent'ly called, is etectua'lly held in the: cons tainer during swinging or rotation thereof,

' and the downwardly tapering body 2 ot the container serves to eiectually prevent accidental spilling from the device of metal which may iiow out oi the cupel?. In' the event that any met-al should be spilled from the. cupel, loss ofthis metal or possible injury to the user of the device, will be pre'- vented since the lower end of neck 3^ is closed' by bottom 4 thus rendering it impossible tor any metal which may be spilled into the container to escape therefrom. In addition, bottom wall Ll' serves to efectually resist outward pressure ot cupel A due to centrifugal torce, when the device is in operation, thus eliminating all possiblity of loss or breakage of the cupel while permitting the device to be swung or rotated at high speed to obtain the best results in casting.

What I claim is 1. In a device of the character described, a downwardly tapering body provided with a depending neck closed at its lower end, and means forv holding acupel? placed within the neck against movement awa-y tronithe bottom of said nec-k.

2. In a device of' the character described, a. body provided with a depending neck, and means carried by the neck tor gripping a cupel inserted into said neck.

3. In a deviceA of the character described, a body provided with a depending neck, and an expansible resilient gripping ring carried by the neck and adapt-ed to lit about and secure a= cupel inserted into said neck and through the ring.

Ll. In a device of the character described, a downwardly tapering body provided with a depending neck closed at its lower end, and an expansible resilient ring carried by the neck and adapted to lit about and securel a cupel inserted into said neck and through the ring.

5. In a device ot' the character described, a downwardly tapering body provided withy a depending neck closedat its lower end, saidl neck being provided with diametri'cally opposite slots, and an expansible resilient ring within the neck and provided with a1 radial projection extending through one of said slots, thering being also providedV with angularly disposed terminal elements proj ecting through the otherslot.

6. In a. device of the character described, a downwardly tapering body provided with a dependingl neck closed at its lower end, said neck being 'provided' with diametrically opposite slots, and an eapansible resilient ring Ywithin thev neck and provided with a; radial projection extending through one olf said slots, the ring being' also provided with angularly disposed terminal elements projecting through thel other slot, the neck being provided inv its inner face with an' annularv grooveI adapted for reception ot the ring when the latter is expanded;

In testimony whereof I aiiix my signature;

JOI-IEN- O BOYIJE.

lll) 

